Typewriting machine



Patented Jan. 9, 1923.

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CORNELIUS B. COB/COBALT, OF NEVJ YORK, N. "1., ASSIG'NOB T0 UNDEBIWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWBITING MACHQINE.

T 0 all whom it may concern:

Be it known that I, Conwnmus B. Con- CORAN, a citizen of the United States, residing in borough of the Bronx, in the county of the Bronx, city and State of New York, have invented certain new and useful lmprovements in Typewriting hfachincs, of which the following is a specification This invention relates to typewriting machines, and more particularly to the paperfeed mechanism thereof, and an object of the invention is to provide a paper-feed in which few parts are used, and one which is strong and durable, and yet sufficiently light for the purpose.

A feature of the invention resides in the means for locking the pressure rolls in contact with the platen surface, to thereby create tension between the rolls and platen, de pending upon the flexibility of the rubber rolls only, although, of course, there is a slight flexibility of the shaft on which the rolls are supported, so that the structure is not too rigid. The front and rear rolls are preferably supported by separate hangers which are loose on said shaft, and provision is made for camming the hangers to position such that the rolls oontac-twith the surface of the platen and are positively held in this position. v

A further feature of the invention resides in the construction of the hangers and the cams for moving them to position in contact with the platen surface, and in supporting the hangers when released from contact with the platen surface, the cams being so fori'ncd that rocking movement in one direction moves the rolls into engagement with the platen surface, and rocking movement of the cams in the opposite direction releases the rolls. The cams also act to support the roll hangers in released position.

Other features and advantages will here inafter appear.

In the accompanying drawings, Figure 1 is a front elevation of the parts, showing the pressure rolls, roll hangers and roll controlling cams. i

Figure 2 is an end elevation, showing the pressure rolls in contact with the platen surface. v

Figure 3 is a perspective view, showing particularly the, pressure roll hangers" and the controlling cams for one set thereof.

platen,

the position adapted to engage the pin Figure 4c is an elevational view, similar to Figure 2, showing the rolls in released position.

Referring to the drawings, 1 indicates the side frame-members of the platen frame in which the platen 2 is rotatably mounted. Connecting the side members 1 is a shaft 3 forming the bottom member of the platen frame, and supported on this shaft are a pair of front roll-supporting hangers 4t and a pair of rear roll-supporting hangers 5. These hangers are slotted for the reception of the roller shaft-s 6, and may be supported for limited movement on the shaft 3 in any suitable or desired manner, and,for the purpose of illustration, they are shown ashaving slotted sleeves 7, into the slots of which project pins 8, carried by the shaft 3. Mounted rigidly on a shaft 9 are two pairs of cams, one pair of cams for each set of pressure roll'hangers. These cams consist of a member 10 and a member 11. "Since these members are both rigidly mounted on the shaft 9, they move as one piece when the I,

shaft is moved. Eachof cams lOhas a follower or cam face 12, which is adapted to engage a cam face 13 formed on each hanger 4:, so that when the shaft 9 1s rocked from tlIGQPOSltiOIl shown in Figure 4; to the position shown in. Figure 2, the hanger 4: is

moved tobring the front pressure rolls into contact with the platen surface and hold them positively in this position. The member 11. has acam follower p111 l ifor engagement with a cam 15 formed on the hanger 5, so that when the shaft 9 is rocked from the Figure 4 position to the Figure 2 position, the hanger 5 will likewise be rocked on the shaft to move its rolls in contact w'th the platen surface; When the shaft 9 is rocked to release the pressure rolls, the hangers a move under gravity away from the and are supported by the cams in released position, the camface 12 moving to shown in Figure 4, wherein it is still in contact with the face 13of the hanger 4, thereby supporting said hanger. .To similarly support the hanger 5, said hanger has a slot, the bottom wall of which is 1 1 to limit the downward movement'of, the hanger when the rolls are in released position, as shown in Figure i.

The S i 9 may be rocked by any suitable means, and, as shown, said shaft is provided with a bent portion 16 at its righthand end, Figure 1, to which is connected a link 17, the upper end of which is pivotally connected with an arm 18 of a pressure roll release lever 19 formed as a rock arm on the usual short shaft 21 to which the lever 19 is fast. The link 17 and arm 18 form substantially a toggle joint to positively hold against the platen the rubber rolls of the roll shafts 6, so that the slight flexibility of the rubber and the shafts 6 furnishes substantially the whole resiliency of the. feed-roll supports. The release lever 19 has a spring 20, thrusting from a bracket 24 pivoted at 25 to an arm 26 of the lever 19, said lever 2a supported by extending into the barrel of the spring 20, which is of sufiicicnt strength to hold the cams in operative position when the shaft 9 has been rocked to move the pressure rolls into conact with the platen surface, so that no accidental jarring will break the toggle joint formed by the link 17 and lever 18. The lever 19 is arrested at the effective toggle position by a bracket 27, and its throw in the opposite direction is limited by the catching of the pin 1 1 in the slot :28 at the end of the cam 15.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of pressurerolls for said platen, and means including positive connections extending from the frame to said rolls for locking said rolls in position in contact with said platen, said rolls being incapable of movement away from said platen except by actuating said positive connections 2o release said rolls from the locking posiion.

2, In a typewriting machine, the combinat on with a platen and a frame in which it 1s journaled, of pressure-rolls for said platen, and means including positive connect1ons extending from the frame to said rolls for locking said rolls in position in contact with said platen, said rolls being in capable of movement away from said platen except by actuating said positive connec- 110118 130 release said rolls from the locking position, said pressurerolls being adapted to fall by gravity away from said platen when the positive connections are actuated to release said rolls.

3. In a typewriting machine, the c.ombi-- nation with a platen and a frame in which it is journaled, of pressure rolls therefor, hangers supporting said rolls, a shaft on which said hangers are mounted, and cam- 22 against a shoulder 23 of a floating lever ming means having positive connections both to said frame and said hangers to hold said rolls in contact with said platen.

1. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of pressure rolls therefor, a shaft, hangers loosely mounted on said shaft, a second shaft, cams on said second shaft, and means 11 ving positive connections both to said frame and said cams for moving said cams to engage said hangers to hold said rolls positively in contact with the platen surface. 1

5. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of front and rear pressure rolls therefor, separate hangers supporting the two sets of rolls, cams operable as one piece, and means having positive connections both to said frame and said cams for rocking said cams in one direction to engage said hangers to positively move said rolls into engagement with the platen sun face, and hold them in such engagement, and. for rocking said cams in another direction to release said rolls.

6. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of a pressure roll therefor, a shaft for said roll, a roll hanger on which said shaft is journaled and having a cam face, a follower movable to engage said face to move said roll into contact with the surface of the platen, a journal for said follower fast on said frame, and Imeans having positive connections to said follower and said frame adapted to operate the follower.

7. In a typewriting machine, the combination with a platen and a framein which it is journaled, of a pressure roll therefor, a shaft for said roll, a roll hanger on which said shaft is journaled, and having a cam face, a follower movable to engage said cam face to move said roll into contact with the surface of the platen, a journal for said follower fast on said frame, means havingpositive connections to said follower and said frame adapted to operate the follower, and means to cause the follower to hold said cam. face to so hold the roll.

8. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of a pressure roll therefor, a

shaft for said roll, a hanger on which said Shaft is journaled and having a cam face, a follower movable to engage said cam face to move said roll into contact with the surface of the platen, a journal for said follower fast on said frame, means having positive connections to said follower and said frame adapted to operate the follower, and single resilient means to hold said-operating means in either of its positions In a typewriting machine, the combine- Cit tion with a platen. and a frame in which it is journaled, of a pressure roll therefor, a shaft for said roll, a roll hanger on which the shaft is journaled and'havinga cam face, a cam normally in engagement with the hanger, whereby the roll is supported in released position by said cam, and positive connections extending from the frame to the hanger for operating the cam to move the roll against the platen.

, lO.' In a typewriting machine, the combination with a platen and a trame in which it 18 ournaled, of a pressure roll therefor,a

shaft for said roll, a roll hanger in which the shaft is journaled, said hanger having aslot therein, and means including an operating element positively connecting the frame and roll hanger to move said roll into contact with the platen surface, said operating element being also movable to a position such as to release said hanger, said operating element also comprising means for engagement with the bottom Wall of said slot to limit the downward movement of said hanger.

11. In a typewriting machine, the combination with a platen and a frame in which it is journaled, of a pressure roll therefor, a

shaft for said roll, a hanger in which said shaft is journaled, said hanger having a slot and a cam face adjacent said slot, and a follower having positive connections extending from the frame to engage said cam face to move said hanger, to thereby move the pressure roll in contact with the platen surface, said follower movable to release said roll under the action of gravity, the bottom wall of the slot in said hanger engaging said fol-lower to limit the downward movement of the hanger.

12in a typewriting machine, the combination with a platen and a frame in which it is journaled, of rubber pressure rolls therefor, shafts on which said rolls are journaled, and means forming positive connections from the frame to the shafts for locking said pressure rolls in contact with the platen surface, thereby creating tension be tween said rolls and surface, depending upon the flexibility of the rubber only.

CORNELIUS B. CORCORAN.

Witnesses: I

'CATHERINIQ A. NEWELL,

JENNIE P. THORNE. 

